I. Origins and History

1. The Origin of Bazhen Tang

Bazhen Tang originates from ancient classical medical texts and has a long historical lineage. It is a representative formula in Chinese medicine for tonifying both qi and blood, with its prototype traceable to an even earlier period. Through prolonged clinical practice, ancient physicians gradually came to recognise the importance of qi and blood for the body's health, continually exploring and summarising herb combinations that could effectively tonify qi and blood, and Bazhen Tang emerged against this backdrop.

2. Historical Evolution

As time passed, Bazhen Tang continued to develop and be refined through the transmission and application of physicians across successive generations. Physicians of different dynasties adjusted and optimised the formula according to clinical experience. For example, the selection of herbs became more precise, and the dosage proportions more rational. It has played an important role in every period, saving countless patients with qi-blood deficiency, becoming a shining pearl in the treasury of Chinese medicine formulas.

II. Herb Composition (Sovereign, Minister, Assistant, Envoy)

1. Chief Herb — Renshen

Renshen (Ginseng) greatly tonifies original qi and restores the pulse and stems collapse, making it an essential herb for rescuing critical, collapsing conditions. It greatly tonifies the body's original qi, allowing the qi of all the organs to become abundant, strengthening the body's resistance and immunity. In Bazhen Tang, Renshen serves as the chief herb, playing a leading and pivotal role, laying the foundation for the generation of qi and blood.

2. Deputy Herb — Shudihuang

Shudihuang (Prepared Rehmannia Root) nourishes yin and tonifies blood, enriching essence and marrow. Its texture is rich and moist, able to nourish liver-kidney yin, making it an essential herb for tonifying blood. Combined with the chief herb Renshen, it tonifies both qi and blood, together bearing the important task of tonifying qi and blood, making it an indispensable deputy herb in Bazhen Tang.

3. Assistant Herbs — Baizhu and Fuling

Baizhu (Atractylodes Rhizome) strengthens the spleen, boosts qi, dries dampness, and promotes urination. Fuling (Poria) promotes urination and drains dampness, strengthens the spleen, and calms the heart. Both have the action of strengthening the spleen, able to promote spleen-stomach transportation and transformation function, ensuring qi and blood have a source for their generation. They assist the chief and deputy herbs in exerting their actions more effectively, while also preventing the herbs from being too cloying and affecting spleen-stomach transportation and transformation, making them the assistant herbs in Bazhen Tang.

4. Envoy Herb — Zhigancao

Zhigancao (Honey-Fried Licorice) tonifies the spleen and harmonises the stomach, boosting qi and restoring the pulse. It harmonises the various herbs, allowing the different herbs in the formula to work together synergistically, while also moderating the toxicity and fierce nature of the herbs. As the envoy herb, Zhigancao plays a bridging and coordinating role in Bazhen Tang.

III. Pathomechanism, Actions, and Indications

1. Pathomechanism

The pathomechanism targeted by Bazhen Tang is mainly combined qi-blood deficiency. Due to various causes such as insufficient congenital endowment, poor postnatal nourishment, prolonged illness leading to bodily weakness, or excessive physical strain, the body's qi and blood become deficient and organ function becomes disordered. When qi and blood are insufficient, they cannot nourish the organs, channels, and limbs, giving rise to a series of symptoms.

2. Actions

Bazhen Tang has the action of tonifying both qi and blood. By tonifying qi and blood, it ensures the body's qi and blood are sufficient and organ function is restored to normal, thereby achieving the goal of supporting righteous qi, expelling pathogens, and strengthening the body.

3. Indications

Bazhen Tang mainly treats the pattern of combined qi-blood deficiency. Symptoms include a pale or sallow complexion, dizziness, palpitations and fearful throbbing, shortness of breath with fatigue, poor appetite, a pale tongue with a white coating, and a thin, weak pulse. These symptoms all arise from qi-blood deficiency, and Bazhen Tang provides good therapeutic effect for them.

IV. Formula Analysis

1. The Principle of Mutual Generation Between Qi and Blood (Sijunzi Tang + Siwu Tang)

In the formula, Renshen and Shudihuang together serve as chief herbs — Renshen greatly tonifies original qi, while Shudihuang nourishes yin and tonifies blood; the two, one yang and one yin, tonify qi and generate blood, embodying the principle of mutual generation between qi and blood. Qi can generate blood, but the sufficiency of qi in turn depends on nourishment from blood; blood carries qi, and qi and blood are mutually dependent and mutually promoting.

2. The Importance of Spleen-Stomach Transportation and Transformation Function

Baizhu and Fuling strengthen the spleen and eliminate dampness, promoting spleen-stomach transportation and transformation function. The spleen and stomach are the root of postnatal constitution, and the source of qi and blood production. Only when spleen-stomach function is normal can ingested food be transformed into qi and blood. Bazhen Tang, by regulating the spleen and stomach, ensures the source of qi-blood generation, allowing qi and blood to be continuously produced.

3. Synergistic Action of the Herbs (Tonifying Both Qi and Blood)

Zhigancao harmonises the various herbs, allowing the different herbs in the formula to work together synergistically. The five herbs — Renshen, Shudihuang, Baizhu, Fuling, and Zhigancao — combine together, tonifying qi and blood without causing stagnation or cloying richness, and strengthening the spleen and harmonising the stomach without being too fierce, together achieving the effect of tonifying both qi and blood.

V. Comparison with Related Formulas

1. Comparison with Guipi Tang

Guipi Tang mainly emphasises tonifying the heart and spleen, and nourishing blood to calm the spirit, and is suited to combined heart-spleen qi-blood deficiency accompanied by symptoms such as insomnia, excessive dreaming, and forgetfulness. Bazhen Tang, on the other hand, places greater emphasis on tonifying both qi and blood, and is suited to a simple pattern of combined qi-blood deficiency. The two formulas differ somewhat in emphasis, but both have the action of tonifying qi and blood.

2. Comparison with Shiquan Dabu Tang

Shiquan Dabu Tang is formed by adding Huangqi (Astragalus Root) and Rougui (Cinnamon Bark) to Bazhen Tang, strengthening the action of warmly tonifying qi and blood. It is suited to patients with combined qi-blood deficiency who also lean toward deficiency-cold. Bazhen Tang is comparatively more gentle, while Shiquan Dabu Tang has a stronger warming, heating nature.

VI. Clinical Applications

1. Internal Medicine Disorders

In internal medicine, Bazhen Tang is commonly used to treat conditions of combined qi-blood deficiency such as anaemia, chronic fatigue syndrome, and neurasthenia. For anaemia patients, Bazhen Tang can raise haemoglobin levels and improve anaemia symptoms. For patients with chronic fatigue syndrome, it can strengthen physical stamina and relieve fatigue.

2. Gynaecological Disorders

In the gynaecological field, Bazhen Tang can be used to treat disorders caused by qi-blood deficiency such as irregular menstruation, amenorrhoea, and dysmenorrhoea. For irregular menstruation, especially in patients with scanty, pale, and thin menstrual flow, Bazhen Tang can regulate the menstrual cycle and increase menstrual flow.

3. Surgical Recovery

After surgery, if a patient presents with qi-blood deficiency, Bazhen Tang may also be applied for conditioning. It can promote postoperative bodily recovery, strengthen the body's resistance, and help prevent infection.

VII. Clinical Modifications

1. Pronounced Qi Deficiency

If qi deficiency is pronounced, Huangqi and Dangshen (Codonopsis Root) may be added to strengthen the qi-tonifying action. Huangqi tonifies qi and raises yang, consolidating the exterior and stopping sweating; Dangshen tonifies the middle and boosts qi, strengthening the spleen and benefiting the lung; combined with the herbs in Bazhen Tang, they work synergistically to better tonify qi deficiency.

2. Pronounced Blood Deficiency

For those with pronounced blood deficiency, Danggui (Angelica Root) and Baishao (White Peony Root) may be added to strengthen the blood-tonifying action. Danggui tonifies and activates blood, regulating menstruation and relieving pain; Baishao nourishes blood and regulates menstruation, astringing yin and stopping sweating; the two can further nourish the blood and improve blood-deficiency symptoms.

3. Yang Deficiency

For those with yang deficiency, Fuzi (Aconite) and Rougui (Cinnamon Bark) may be added to warm yang and disperse cold. Fuzi restores yang and rescues from collapse, tonifying fire and assisting yang, dispersing cold and relieving pain; Rougui tonifies fire and assists yang, guiding fire back to its source, dispersing cold and relieving pain; together they strengthen the formula's warming, heating nature, treating yang-deficiency disorders.

VIII. Dosage and Preparation (Traditional Method and Modern Concentrated Granules)

1. Traditional Method

The traditional method involves decocting the herb slices in water. Generally, Renshen, Shudihuang, Baizhu, Fuling, Danggui, Chuanxiong (Szechuan Lovage Rhizome), Baishao, and Zhigancao are each used at 9g, combined with an appropriate amount of water and soaked for 30 minutes, then brought to a boil over high heat and simmered over a low flame for around 30 minutes; the liquid is strained off. This decoction is repeated twice, and the two batches of liquid are combined and taken in two divided doses.

2. Modern Concentrated Granules (Bazhen Wan Pills Are Also Produced)

Modern concentrated granules are more convenient to take. The concentrated granules of Bazhen Tang are formulated according to a set proportion; generally, one sachet is taken at a time, dissolved in boiled water, twice daily. The concentrated granules preserve the efficacy of the traditional formula while being convenient to carry and take.

IX. Precautions and Contraindications

1. Dietary Precautions

While taking Bazhen Tang, raw, cold, greasy, and spicy irritating foods should be avoided. Raw and cold foods can readily damage spleen-stomach yang qi; greasy foods are difficult to digest and increase the burden on the spleen and stomach; spicy foods readily foster fire and generate heat, affecting the herbs' efficacy.

2. Special Populations

Use Bazhen Tang with caution in pregnancy, as the herbs in the formula may affect the fetus. It is not suitable for those with excess patterns such as fever from a common cold, internal excess heat, or damp-heat, to avoid trapping the pathogen inside and worsening the condition.

3. Adverse Reactions

A small number of people may experience symptoms such as dry mouth or constipation after taking Bazhen Tang, which may be related to the herbs' warming nature. If discomfort occurs, the medication should be discontinued promptly and a physician consulted.

X. Modern Research

1. Effects on the Immune System

Modern research shows that Bazhen Tang can regulate the body's immune system and strengthen immune function. It can promote the proliferation and differentiation of lymphocytes and enhance the phagocytic capacity of macrophages, thereby strengthening the body's resistance and helping to prevent disease.

2. Effects on the Haematopoietic System

Bazhen Tang has a certain promoting effect on the haematopoietic system. It can stimulate the proliferation of bone marrow haematopoietic stem cells, raising the count of red blood cells, white blood cells, and platelets in the peripheral blood, offering positive significance for improving anaemia and other blood system disorders.

3. Effects on the Cardiovascular System

Bazhen Tang also has a certain regulatory effect on the cardiovascular system. It can dilate blood vessels, lower blood pressure, improve cardiac function, and increase myocardial blood and oxygen supply, offering potential application value for the prevention and treatment of cardiovascular disease.

Summary of Bazhen Tang

Bazhen Tang, used as a medicinal food preparation, is a classical formula for tonifying both qi and blood, formed by combining and modifying Sijunzi Tang and Siwu Tang. It has the actions of boosting qi and strengthening the spleen, tonifying qi, tonifying blood, activating blood and moving qi, and harmonising the various herbs, and is suited to combined qi-blood deficiency, conditions requiring tonification of both qi and blood, weakness after illness, indigestion, fatigue of the limbs, palpitations and fearful throbbing, a pale complexion, shortness of breath with disinclination to speak, irregular menstruation, and dysmenorrhoea. The formula is composed of Renshen, Baishao (Peony Root), Fuling, Zhigancao, Danggui, Shudihuang, Chuanxiong, Shengjiang (Fresh Ginger), and Dazao (Jujube), among others; clinical forms include Bazhen San (powder) and Bazhen Wan (pills), and it is closely related to Shiquan Dabu Tang and Renshen Yangrong Tang. Those with a heat-leaning constitution should use it under the guidance of a qualified TCM practitioner.